High flow catted downpipes on x6m

I have been looking at catless DP on my 2012 x6m but running into issues with my Dinan tune compadability but I found these today...http://www.ultimate-racing.com/xcart...&cat=0&page=14
Has anyone had any experience with this company or input on if it would be worth it to do- I have evo akrapovic exhaust with Dinan tune but am looking for a bit more power and sound.